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Kubernetes should have 'Automatic upgrade' enabled

Default Severity: low

Explanation

Automatic updates keep nodes updated with the latest cluster master version.

Possible Impact

Nodes will need the cluster master version manually updating

Suggested Resolution

Enable automatic upgrades

Insecure Example

The following example will fail the google-gke-enable-auto-upgrade check. 

 resource "google_service_account" "default" {
   account_id   = "service-account-id"
   display_name = "Service Account"
 }

 resource "google_container_cluster" "primary" {
   name     = "my-gke-cluster"
   location = "us-central1"

   # We can't create a cluster with no node pool defined, but we want to only use
   # separately managed node pools. So we create the smallest possible default
   # node pool and immediately delete it.
   remove_default_node_pool = true
   initial_node_count       = 1
 }

 resource "google_container_node_pool" "bad_example" {
   name       = "my-node-pool"
   cluster    = google_container_cluster.primary.id
   node_count = 1

   node_config {
     preemptible  = true
     machine_type = "e2-medium"

     # Google recommends custom service accounts that have cloud-platform scope and permissions granted via IAM Roles.
     service_account = google_service_account.default.email
     oauth_scopes = [
       "https://www.googleapis.com/auth/cloud-platform"
     ]
   }
   management {
     auto_upgrade = false
   }
 }

Secure Example

The following example will pass the google-gke-enable-auto-upgrade check. 

 resource "google_service_account" "default" {
   account_id   = "service-account-id"
   display_name = "Service Account"
 }

 resource "google_container_cluster" "primary" {
   name     = "my-gke-cluster"
   location = "us-central1"

   # We can't create a cluster with no node pool defined, but we want to only use
   # separately managed node pools. So we create the smallest possible default
   # node pool and immediately delete it.
   remove_default_node_pool = true
   initial_node_count       = 1
 }

 resource "google_container_node_pool" "good_example" {
   name       = "my-node-pool"
   cluster    = google_container_cluster.primary.id
   node_count = 1

   node_config {
     preemptible  = true
     machine_type = "e2-medium"

     # Google recommends custom service accounts that have cloud-platform scope and permissions granted via IAM Roles.
     service_account = google_service_account.default.email
     oauth_scopes = [
       "https://www.googleapis.com/auth/cloud-platform"
     ]
   }
   management {
     auto_upgrade = true
   }
 }